如何使用Zedgraph库在C#应用程序中更改鼠标光标?
问题描述:
我可以成功地在vanilla C#应用程序中更改鼠标光标,如here所述。我正在使用C#应用程序,它使用Zedgraph dll绘制图表。当鼠标指针位于图表的顶部时,它会转入交叉线。我需要将光标更改为另一个图像。不过,我无法使用较早的代码示例执行此操作。我怀疑这是因为Zedgraph库已经重载了游标更改事件。 zgObj是下面给出的代码中的Zedgraph对象。有任何想法吗?如何使用Zedgraph库在C#应用程序中更改鼠标光标?
void ToggleCursor()
{
Bitmap bitmap = new Bitmap(@"C:\Documents and Settings\Martin\My Documents\My Pictures\line.bmp");
zgObj.Cursor = XCursor.CreateCursor(bitmap, 0, 0);
bitmap.Dispose();
}
public class XCursor : Form
{
[DllImport("user32.dll")]
public static extern IntPtr CreateIconIndirect(ref IconInfo icon);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetIconInfo(IntPtr hIcon, ref IconInfo pIconInfo);
public static Cursor CreateCursor(Bitmap bmp, int xHotSpot, int yHotSpot)
{
IntPtr ptr = bmp.GetHicon();
IconInfo tmp = new IconInfo();
GetIconInfo(ptr, ref tmp);
tmp.xHotspot = xHotSpot;
tmp.yHotspot = yHotSpot;
tmp.fIcon = false;
ptr = CreateIconIndirect(ref tmp);
return new Cursor(ptr);
}
}
public struct IconInfo
{
public bool fIcon;
public int xHotspot;
public int yHotspot;
public IntPtr hbmMask;
public IntPtr hbmColor;
}
答
终于解决了问题,如下图所示
Cursor lineCursor = null; //declared in the main application class
bShowLineCursor = false;
private void zgObj_CursorChanged(object sender, EventArgs e)
{
if (bShowLineCursor)
{
bShowLineCursor = false;
Bitmap bitmap = new Bitmap(@"C:\Documents and Settings\My Documents\My Pictures\line.bmp");
lineCursor= XCursor.CreateCursor(bitmap, 0, 0);
bitmap.Dispose();
}
if (lineCursor != null)
zgObj.Cursor = lineCursor;
}
void ToggleCursor()
{
bShowLineCursor = true;
}
public class XCursor : Form
{
[DllImport("user32.dll")]
public static extern IntPtr CreateIconIndirect(ref IconInfo icon);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool GetIconInfo(IntPtr hIcon, ref IconInfo pIconInfo);
public static Cursor CreateCursor(Bitmap bmp, int xHotSpot, int yHotSpot)
{
IntPtr ptr = bmp.GetHicon();
IconInfo tmp = new IconInfo();
GetIconInfo(ptr, ref tmp);
tmp.xHotspot = xHotSpot;
tmp.yHotspot = yHotSpot;
tmp.fIcon = false;
ptr = CreateIconIndirect(ref tmp);
return new Cursor(ptr);
}
}
public struct IconInfo
{
public bool fIcon;
public int xHotspot;
public int yHotspot;
public IntPtr hbmMask;
public IntPtr hbmColor;
}
答
ZedGraph控件具有Cursor属性。将它设置为任何你想要的。
我不工作。看起来很明显但很奇怪。我在“鼠标向下”事件中更改了光标,但如果我完全移动鼠标,则光标会变回十字,即使我不在任何位置执行此操作。 – 2013-10-24 19:25:27